Double Duty^®-4 Steam Trap/Pump Combination

Ductile Iron

For pressures to 72 psig (4.9 bar) . . .
Trapping Capacities to 4,400 lb/hr (1995 kg/hr)
Pumping Capacities to 350 lb/hr (158 kg/hr) 

The Armstrong Double Duty^® series steam trap/pump combinations are a low maintenance, low-profile solution for draining heat exchangers in various applications. The Double Duty^® series offers you the versatility of combining a pump within a steam trap to aide in condensate drainage from a heat exchanger under all operating conditions (100% turndown).

• Economical. non-electric operation
• Low-maintenance operation. No leaking seals, impeller or motor problems. No NPSH issues.
• Space-saving size. Low-profile body fits in tight spaces while allowing minimal fill head.
• Lower installation costs. Single trade installation.
• Peace of mind. Intrinsically safe.
• Ductile iron durability. Rugged construction material means long service life.
• Efficiency. A closed loop means no motive or flash steam is lost. All valuable Btu’s are captured and returned to the system.
• Safety. The trap/pump can be used in pits or sumps without fear of electrocution or circuit breaker defaults.

Typical applications

• Low-pressure heating systems
• Process heat exchanger or coils with modulating steam control
• Systems under vacuum
• Hazardous (explosion-proof) areas
• Flash tanks

NOTE: Armstrong can also custom fabricate packages to meet your specific needs. Pre-piped Low Boy™, closed-loop and custom-fabricated skid packages are available.